{"id":"CVE-2026-30913","state":"PUBLISHED","title":"flarum/nickname: Display name injection in notification emails (autolink & markdown)","description":"Flarum is open-source forum software. When the flarum/nicknames extension is enabled, a registered user can set their nickname to a string that email clients interpret as a hyperlink. The nickname is inserted verbatim into plain-text notification emails, and recipients may be misled into visiting attacker-controlled domains.","publishedAt":"2026-03-09T22:42:40.014Z","updatedAt":"2026-03-10T14:17:30.046Z","severity":{"score":4.6,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["flarum nicknames"],"affected":[{"vendor":"flarum","product":"nicknames","versions":[{"version":"< 1.8.3","status":"affected"}]}],"references":["https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25","https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28","https://github.com/flarum/nicknames/releases/tag/v1.8."],"weaknesses":["CWE-79"],"ingestedAt":"2026-10-29T20:11:31.369Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/30xxx/CVE-2026-30913.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-30913","state":"PUBLISHED","datePublished":"2026-03-09T22:42:40.014Z","dateUpdated":"2026-03-10T14:17:30.046Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-07T16:40:05.883Z"},"containers":{"cna":{"title":"flarum/nickname: Display name injection in notification emails (autolink & markdown)","descriptions":[{"lang":"en","value":"Flarum is open-source forum software. When the flarum/nicknames extension is enabled, a registered user can set their nickname to a string that email clients interpret as a hyperlink. The nickname is inserted verbatim into plain-text notification emails, and recipients may be misled into visiting attacker-controlled domains."}],"affected":[{"vendor":"flarum","product":"nicknames","versions":[{"version":"< 1.8.3","status":"affected"}]}],"references":[{"url":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25","name":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28","name":"https://github.com/flarum/nicknames/commit/4dde99729abdce8f6e2a7437c86e38735fdcca28","tags":["x_refsource_MISC"]},{"url":"https://github.com/flarum/nicknames/releases/tag/v1.8.","name":"https://github.com/flarum/nicknames/releases/tag/v1.8.","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.6,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-79","lang":"en","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-09T22:42:40.014Z"},"source":{"advisory":"GHSA-3c4m-j3g4-hh25","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/flarum/framework/security/advisories/GHSA-3c4m-j3g4-hh25","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-10T14:17:25.125303Z","id":"CVE-2026-30913","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-10T14:17:30.046Z"}}]}}}